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It's most likely your heater core that is causing the problem it could be leaking either from the core it's self causing anti freeze to get into your vents or from one of the hoses leading to it.....I am assuming that when your heat is on there is a dampness in the air this is what is causing the windows to fog up.
Heater radiator leak.It is under the windscreen and can blow hot water (vapor) to the glass.Does it slightly smells heated water?Very rare:rain water in the saim compartment as the heater having the same simptoms.Track the problem,ceck coolant level regularly.Cheers,hope u deal it,let others know.
This may be due to a bad heater core or dirty core with a plugged water drain, first see if the a/c works. turn it on and see if the air gets cold and if the ac compressor works.
The way the defrost works to keep windows from fogging up is that when the front defroster is tuned on the ac should also be on, on most cars when you go to defrost it will turn ac on automatic. the system then uses hot and cold air to remove the moisture in the air to avoid window fogging. if your a/c is not working then that may cause window to fog, but if you are also getting a smell then the drain that lets out condensation may be plugged and then water builds up and also mold from always being wet and when heat is on you smell that.
i want you to run the defrost and when windows fog up wipe window with hand and see if it is greasy . if it feels oily then you may have a bad heater core, the core leaks coolant out and steam and causing windows to fog up with a flim of grease.
If the fog is slippery and not water vapor you may have a pin hole in your heater core. Try adding a stop leak to seal the heater core leak. If not, try pushing the AC button. On most foreign cars the AC compressor does not stay on long enough on defrost to clear the windows.
Your windshelid fogs up because of the cold air outside mixing with the
warm air inside your car, causing the water vapor in the air to stick
to your windsheild. Just turn down the heat a bit to solve the problem.